No, 'think' and 'believe' should not be used interchangeably in all cases. While they can sometimes be used to express similar ideas, the subtle difference in the level of certainty should be considered when choosing the appropriate word.
Yes, there are some instances where 'think' and 'believe' can be used interchangeably, particularly in casual or informal speech. For example, you could say 'I think it's going to rain today' or 'I believe it's going to rain today' and the meaning would be largely the same.
Context matters in English because the meaning of words can vary based on the surrounding words, phrases, or situation. Words often have multiple meanings, and the intended sense becomes clear through the context in which they are used.
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